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4x+2y=22, (y/2)+(x/4)=2.5

x=4,y=3

Answered by Ieuan L. • Maths tutor

2482 Views

2 chocolates weight 250g, there are 220 calories in 100g of chocolate. How many calories are in one chocolate?

275 Calories

Answered by Ieuan L. • Maths tutor

3972 Views

Solve these simultaneous equations: 3x-5=-4y and 2xy=-4

First start with 2xy=-4, rearrange to find in terms of x, x=-2/y. Substitute this into the other equation (3x-5=-4y), producing -6/y -5 =-4y.Times every term by -y resulting in 6+5y=4y².Rearr...

Answered by Amelia S. • Maths tutor

2925 Views

How do you differentiate using the chain rule?

At first the chain rule can seem quite daunting and convoluted but with a few examples over the course of this lesson, it will seem simpler and more intuitive.
The chain rule is used where the equat...

Answered by Alex K. • Maths tutor

2721 Views

When working with probabilities why is it sometimes necessary to add and sometimes to multiply?

Whether you need to add or multiply depends on whether it is a case of 'AND' or 'OR'. For 'AND' you multiply, and for 'OR' you add. Below are examples of each case, using dice as an example: To calculate ...

Answered by Marcus W. • Maths tutor

2586 Views